Vanessa Hudgens and Naya Rivera Stand Up To Cancer Tonight

In June, a ton of major celebs appeared in an awesome PSA for the Stand Up To Cancer organization, promoting the non-profit's September 10 telethon. From that group, JSYK faves Vanessa Hudgens, Naya Rivera are set to appear at the star-studded fundraiser.

But the PSA also involves a bunch of other celebs that have not RSVP'd to the televised event. Who are the biggest disappointments? Zac Efron and Dakota Fanning, for sure. Here's why...
Dakota narrated the entire PSA and had a super cute baseball shot with Naya, while Zac starred in a very memorable, not to mention hilarious, scene in which he got stuck in an elevator with a bunch of girls. We guess their busy schedules prevented them from being involved with the telecast, but we're still holding out for a last-minute appearance.

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